Al-FeF3复合燃料的制备及应用性能

Preparation and Application Performance of Al-FeF3 Composite Fuel

针对固体推进剂在改进铝粉燃烧性能方面的迫切需要,以铝粉为基材,FeF3作为添加剂,采用高能球磨法制备Al-FeF3复合燃料。通过研究粉末配比、球磨参数等对铝基复合燃料组织、结构以及热性能等的影响,优化制备工艺,获得平均粒径为微米级的铝基复合燃料。热重-差示扫描量热联用技术(TG-DSC)表明,Al-FeF3复合燃料在氧化过程中,可以实现较低温度下(600~1400℃)的快速氧化。端燃75发动机试车表明,使用Al-FeF3复合燃料全部取代普通球形铝粉后发动机壳体内部无较大铝粉熔融残渣,残渣率从6.151%下降到4.215%。结果表明,Al-FeF3复合燃料有助于解决Al粉在推进剂中不完全燃烧的问题,在降低燃烧残渣率,减少发动机两相流损失方面有着潜在应用价值。

In order to improve the combustion performance of aluminum powder in the solid propellants,the aluminum matrix composite was prepared by high energy ball milling with aluminum powder as matrix and FeF3 as additive. The effects of powder ratio and milling parameters on the micromorphology,structure and thermal properties of aluminum matrix composites were studied. The micron grade aluminum matrix composites were prepared by optimized process. TG-DSC analysis showed that Al-FeF3 composite can realize fast oxidation at lower temperature(600-1400 ℃)in the oxidation process. The end-fired 75 engine test demonstrated that no large molten aluminum powder residue was observed in the engine shell after replacing spherical Al with Al-FeF3 composite. The residue rate was decreased from 6.151% to 4.215%,indicating enhanced combustion efficiency for the Al-FeF3 composite. Therefore,Al-FeF3 composite has potential application value in reducing combustion residue rate of solid propellant and two-phase flow loss of engine.